MatIncreaseOverlapSplit#

Given a set of submatrices indicated by index sets across a sub communicator, replaces the index sets by larger ones that represent submatrices with additional overlap.

Synopsis#

#include "petscmat.h" 
PetscErrorCode MatIncreaseOverlapSplit(Mat mat, PetscInt n, IS is[], PetscInt ov)

Collective

Input Parameters#

  • mat - the matrix

  • n - the number of index sets

  • is - the array of index sets (these index sets will changed during the call)

  • ov - the additional overlap requested

` Options Database Key#

  • -mat_increase_overlap_scalable - use a scalable algorithm to compute the overlap (supported by MPIAIJ matrix)

See Also#

Matrices, Mat, MatCreateSubMatrices(), MatIncreaseOverlap()

Level#

developer

Location#

src/mat/interface/matrix.c

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